Water Parameters ?

[tomreefer]

I am using reef crystals my tank volume is roughly 50 gallons.

I am using API test kits

Nitrate 5ppm
PH 8.15 (Neptune probe)
Calcium 360
ALk 9dkh

I just did a 8 gallon water change and I am wondering why my calcium level is low. Test kit faulty but even if it was faulty can it be way off?

 

[Stackemdeep]

Tom, your Mag is not listed. I learned the hard way getting water chem down pat and this is my experience. Get the big three (Alk, Ca and Mg) tests by Salifert. I found them more accurate and reliable than API. Test Mg first and get your LFS to second test it for you to confirm. Once it is 1250-1350, then adjust your Ca slowly. Ca should be 390-450. Don't chase PH, in fact don't even really worry about it. Reef Crystals should have plenty of Mg and the KH will run a bit high. Also use a calibrated refractometer to be sure your SG is correct. If I recall Reef crystals should run higher than your numbers if the SG truly is 1.025-1.026. Good Luck.

 

[tomreefer]

I never checked Mag to be honest. I need to get this test kit. My refractometer is showing 1.026

Ok I will get Salifert

 

[Sugar Magnolia]

Mag is very important when trying to raise and maintain calcium levels. Good advice given above. :thumbsup:

 

[gone fishin]

Yes good advice. Through the magic of chemistry the magnesium will help to keep the calcium stable allowing you to maintain a level that you want. Good luck.